<template>
  <div class="progress-circle">
    <!--svg画布-->
    <svg
      :width="radius"
      :height="radius"
      viewBox="0 0 100 100"
      version="1.1"
      xmlns="http://www.w3.org/2000/svg"
    >
      <!--背景圆-->
      <circle
        class="progress-background"
        r="50"
        cx="50"
        cy="50"
        fill="transparent"
      />
      <!--进度条圆-->
      <circle
        class="progress-bar"
        r="50"
        cx="50"
        cy="50"
        fill="transparent"
        :stroke-dasharray="dashArray"
        :stroke-dashoffset="dashOffset"
      />
    </svg>
    <slot></slot>
  </div>
</template>

<script>
export default {
  name: 'progress-circle',
  props: {
    radius: {
      type: Number,
      default: 100
    },
    progress: {
      type: Number,
      default: 0
    }
  },
  data () {
    return {
      // 2πr
      dashArray: 2 * Math.PI * 50
    }
  },
  computed: {
    dashOffset () {
      return (1 - this.progress) * this.dashArray
    }
  }
}
</script>

<style lang="scss" scoped>
.progress-circle {
  position: relative;
  circle {
    stroke-width: 8px;
    transform-origin: center;
    //背景圆
    &.progress-background {
      transform: scale(0.9);
      stroke: $color-theme-d;
    }
    //进度条圆
    &.progress-bar {
      transform: scale(0.9) rotate(-90deg);
      stroke: $color-theme;
    }
  }
}
</style>
